package com.heima.app.gateway.filter;


import com.heima.app.gateway.util.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * 全局过滤器
 */
@Component
@Slf4j
public class AuthorizeFilter implements Ordered, GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        log.info("网关拦截到请求...URI:{}", exchange.getRequest().getURI().getPath());
        //1.获取request 和response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //2.判断是否请求登录,如果是则放行
        if (request.getURI().getPath().contains("/login")) {
            //放行
            return chain.filter(exchange);
        }
        //2.1如果不是请求登录资源, 获取token,校验token: a.不能为空 b.不能过期 c.解析不能出错, 验证通过就放行,验证失败就返回401
        String token = request.getHeaders().getFirst("token");
        if (StringUtils.isBlank(token)) {
            //拦截
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        try {
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            int result = AppJwtUtil.verifyToken(claimsBody);
            if (result == 1 || result == 2) {
                //过期 拦截
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }

            //解析token中的用户信息,存入到请求头中,携带到下游的微服务中
            Object userId = claimsBody.get("id");
           // System.out.println("app-gateway解析token中的id: "+userId);
            ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders -> {
                httpHeaders.add("userId", userId + "");
            }).build();
            //重置请求头
            exchange.mutate().request(serverHttpRequest);

        } catch (Exception e) {
            e.printStackTrace();
            //解析出错 拦截
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //放行
        return chain.filter(exchange);


     /*   log.info("网关拦截到请求...");
        //1.获取request和response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        //2.判断是否是登录
        if (request.getURI().getPath().contains("/login")) {
            //放行
            return chain.filter(exchange);
        }

        //3.获取token ,( 验证token是否有效: a.不能为空 b.不能过期 c.解析不能出错 ) 验证通过放行,验证不通过就返回401.
        String token = request.getHeaders().getFirst("token");

        //4.判断token是否存在
        if (StringUtils.isBlank(token)) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //5.判断token是否有效
        try {
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            //是否是过期
            int result = AppJwtUtil.verifyToken(claimsBody);
            if (result == 1 || result == 2) {
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
        } catch (Exception e) {
            e.printStackTrace();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //6.放行
        return chain.filter(exchange);*/
    }

    /**
     * 优先级设置  值越小  优先级越高
     *
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
